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max v jtag resistors

Altera_Forum
Honored Contributor II
‎07-01-2013 05:09 AM
1,278 Views

I followed the app note for jtag with Max 7000S and it works perfect. I'm switching over to 5M40ZE64C5N, are the 10k and 1k resistor still required? 

 

Also I'm switching from 5v with Max 7000S to 1.8v only for Max V, will there be any issue with JTAG ISP? I'm using USB Blaster. 

 

thanks!
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Altera_Forum
Honored Contributor II
‎07-01-2013 05:26 AM
409 Views

ok found the answer: 

 

For MAX V devices, there are weak pull-up resistors for 

TDI 

and 

TMS 

, and pull-down 

resistors for 

TCK 

. However, in a JTAG chain, there might be some devices that do not 

have internal pull-up or pull-down resistors. In this case, Altera recommends pulling 

the 

TMS 

pin high (through an external 10-k 

 

resistor), and pulling 

TCK 

low (through an 

external 1-k 

 

resistor) during BST or in-system programmability (ISP) to prevent the 

TAP controller from going into an unintended state. Pulling-up the 

TDI 

signal 

externally for the MAX V device is optional.
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